1Heat oven to 350°F (325°F for dark or nonstick pan). Line 9-inch square pan with foil so foil extends about 2 inches over sides of pan. Spray foil with cooking spray. Make brownies as directed on box for 9-inch pan. Cool completely, about 1 1/2 hours.
2Place in freezer 30 minutes. Remove from pan by lifting foil; peel foil away. Cut into 15 rectangular brownies, 5 rows by 3 rows. Gently insert craft stick into end of each. Place on cookie sheet; freeze 30 minutes.
3In small microwavable bowl, microwave chocolate chips and shortening uncovered on High about 1 minute; stir until smooth. If necessary, microwave additional 5 seconds at a time. Dip top one-third to half of each brownie into chocolate; sprinkle with candy sprinkles. Lay flat on waxed paper or foil to dry.